Spring的refresh()方法调用过程
refresh()是Spring中比较核心的方法，Spring所有的初始化都在这个方法中完成
具体代码如下

public void refresh() throws BeansException, IllegalStateException {synchronized (this.startupShutdownMonitor) {// Prepare this context for refreshing.prepareRefresh();// Tell the subclass to refresh the internal bean factory.ConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory();// Prepare the bean factory for use in this context.prepareBeanFactory(beanFactory);try {// Allows post-processing of the bean factory in context subclasses.postProcessBeanFactory(beanFactory);// Invoke factory processors registered as beans in the context.invokeBeanFactoryPostProcessors(beanFactory);// Register bean processors that intercept bean creation.registerBeanPostProcessors(beanFactory);// Initialize message source for this context.initMessageSource();// Initialize event multicaster for this context.initApplicationEventMulticaster();// Initialize other special beans in specific context subclasses.onRefresh();// Check for listener beans and register them.registerListeners();// Instantiate all remaining (non-lazy-init) singletons.finishBeanFactoryInitialization(beanFactory);// Last step: publish corresponding event.finishRefresh();}catch (BeansException ex) {logger.warn("Exception encountered during context initialization - cancelling refresh attempt", ex);// Destroy already created singletons to avoid dangling resources.destroyBeans();// Reset 'active' flag.cancelRefresh(ex);// Propagate exception to caller.throw ex;}}}

Spring中refresh调用过程
//准备工作包括设置启动时间，是否激活标识位，初始化属性源(property source)配置

prepareRefresh();

//创建beanFactory（过程是根据xml为每个bean生成BeanDefinition并注册到生成的beanFactory）

ConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory();

//准备创建好的beanFactory（给beanFactory设置ClassLoader，设置SpEL表达式解析器，设置类型转化器【能将xml String类型转成相应对象】，增加内置ApplicationContextAwareProcessor对象，忽略各种Aware对象，注册各种内置的对账对象【BeanFactory，ApplicationContext】等，注册AOP相关的一些东西，注册环境相关的一些bean

prepareBeanFactory(ConfigurableListableBeanFactory beanFactory)

//实例化并调用BeanFactory中扩展了BeanFactoryPostProcessor的Bean的postProcessBeanFactory方法

invokeBeanFactoryPostProcessors(beanFactory);

//实例化和注册beanFactory中扩展了BeanPostProcessor的bean

registerBeanPostProcessors(beanFactory)方法;

//实例化，注册和设置国际化工具类MessageSource

initMessageSource();

//实例化，注册和设置消息广播类（如果没有自己定义使用默认的SimpleApplicationEventMulticaster实现，此广播使用同步的通知方式）

initApplicationEventMulticaster();

//设置样式工具ThemeSource

onRefresh();

//添加用户定义的消息接收器到上面设置的消息广播ApplicationEventMulticaster

registerListeners();

//设置自定义的类型转化器ConversionService，设置自定义AOP相关的类LoadTimeWeaverAware，清除临时的ClassLoader，冻结配置（没看明白干什么的），实例化所有的类（懒加载的类除外）

finishBeanFactoryInitialization(ConfigurableListableBeanFactory beanFactory);

//注册和设置跟bean生命周期相关的类（默认使用DefaultLifecycleProcessor），调用扩展了SmartLifecycle接口的start方法，使用上注册的广播类消息广播类ApplicationEventMulticaster广播ContextRefreshedEvent事件

finishRefresh();